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<h1 id="sec_name">
<span data-if="hdevelop" style="display:inline;">histo_to_thresh</span><span data-if="c" style="display:none;">T_histo_to_thresh</span><span data-if="cpp" style="display:none;">HistoToThresh</span><span data-if="dotnet" style="display:none;">HistoToThresh</span><span data-if="python" style="display:none;">histo_to_thresh</span> (算子名称)</h1>
<h2>名称</h2>
<p><code><span data-if="hdevelop" style="display:inline;">histo_to_thresh</span><span data-if="c" style="display:none;">T_histo_to_thresh</span><span data-if="cpp" style="display:none;">HistoToThresh</span><span data-if="dotnet" style="display:none;">HistoToThresh</span><span data-if="python" style="display:none;">histo_to_thresh</span></code> — Determine gray value thresholds from a histogram.</p>
<h2 id="sec_synopsis">参数签名</h2>
<div data-if="hdevelop" style="display:inline;">
<p>
<code><b>histo_to_thresh</b>( :  : <a href="#Histogramm"><i>Histogramm</i></a>, <a href="#Sigma"><i>Sigma</i></a> : <a href="#MinThresh"><i>MinThresh</i></a>, <a href="#MaxThresh"><i>MaxThresh</i></a>)</code></p>
</div>
<div data-if="c" style="display:none;">
<p>
<code>Herror <b>T_histo_to_thresh</b>(const Htuple <a href="#Histogramm"><i>Histogramm</i></a>, const Htuple <a href="#Sigma"><i>Sigma</i></a>, Htuple* <a href="#MinThresh"><i>MinThresh</i></a>, Htuple* <a href="#MaxThresh"><i>MaxThresh</i></a>)</code></p>
</div>
<div data-if="cpp" style="display:none;">
<p>
<code>void <b>HistoToThresh</b>(const HTuple&amp; <a href="#Histogramm"><i>Histogramm</i></a>, const HTuple&amp; <a href="#Sigma"><i>Sigma</i></a>, HTuple* <a href="#MinThresh"><i>MinThresh</i></a>, HTuple* <a href="#MaxThresh"><i>MaxThresh</i></a>)</code></p>
</div>
<div data-if="com" style="display:none;"></div>
<div data-if="dotnet" style="display:none;">
<p>
<code>static void <a href="HOperatorSet.html">HOperatorSet</a>.<b>HistoToThresh</b>(<a href="HTuple.html">HTuple</a> <a href="#Histogramm"><i>histogramm</i></a>, <a href="HTuple.html">HTuple</a> <a href="#Sigma"><i>sigma</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#MinThresh"><i>minThresh</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#MaxThresh"><i>maxThresh</i></a>)</code></p>
</div>
<div data-if="python" style="display:none;">
<p>
<code>def <b>histo_to_thresh</b>(<a href="#Histogramm"><i>histogramm</i></a>: Sequence[Union[int, float]], <a href="#Sigma"><i>sigma</i></a>: float) -&gt; Tuple[Sequence[int], Sequence[int]]</code></p>
</div>
<h2 id="sec_description">描述</h2>
<p><code><span data-if="hdevelop" style="display:inline">histo_to_thresh</span><span data-if="c" style="display:none">histo_to_thresh</span><span data-if="cpp" style="display:none">HistoToThresh</span><span data-if="com" style="display:none">HistoToThresh</span><span data-if="dotnet" style="display:none">HistoToThresh</span><span data-if="python" style="display:none">histo_to_thresh</span></code> determines gray value thresholds from a
histogram for a segmentation of an image using <a href="threshold.html"><code><span data-if="hdevelop" style="display:inline">threshold</span><span data-if="c" style="display:none">threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">Threshold</span><span data-if="python" style="display:none">threshold</span></code></a>.
The thresholds returned are 0, the maximum gray value in the
histogram, and all minima extracted from the histogram.  Before the
thresholds are determined, the histogram is smoothed with a Gaussian
smoothing function.
</p>
<p><code><span data-if="hdevelop" style="display:inline">histo_to_thresh</span><span data-if="c" style="display:none">histo_to_thresh</span><span data-if="cpp" style="display:none">HistoToThresh</span><span data-if="com" style="display:none">HistoToThresh</span><span data-if="dotnet" style="display:none">HistoToThresh</span><span data-if="python" style="display:none">histo_to_thresh</span></code> can process the absolute and relative
histograms that are returned by <a href="gray_histo.html"><code><span data-if="hdevelop" style="display:inline">gray_histo</span><span data-if="c" style="display:none">gray_histo</span><span data-if="cpp" style="display:none">GrayHisto</span><span data-if="com" style="display:none">GrayHisto</span><span data-if="dotnet" style="display:none">GrayHisto</span><span data-if="python" style="display:none">gray_histo</span></code></a>.  Note, however,
that here only byte images should be used, because otherwise the
returned thresholds cannot easily be transformed to the thresholds
for the actual image.  For images of type uint2, the histograms
should be computed with <a href="gray_histo_abs.html"><code><span data-if="hdevelop" style="display:inline">gray_histo_abs</span><span data-if="c" style="display:none">gray_histo_abs</span><span data-if="cpp" style="display:none">GrayHistoAbs</span><span data-if="com" style="display:none">GrayHistoAbs</span><span data-if="dotnet" style="display:none">GrayHistoAbs</span><span data-if="python" style="display:none">gray_histo_abs</span></code></a> since this
facilitates a simple transformation of the thresholds by simply
multiplying the thresholds with the quantization selected in
<a href="gray_histo_abs.html"><code><span data-if="hdevelop" style="display:inline">gray_histo_abs</span><span data-if="c" style="display:none">gray_histo_abs</span><span data-if="cpp" style="display:none">GrayHistoAbs</span><span data-if="com" style="display:none">GrayHistoAbs</span><span data-if="dotnet" style="display:none">GrayHistoAbs</span><span data-if="python" style="display:none">gray_histo_abs</span></code></a>.  For uint2 images, it is important to ensure
that the quantization must be chosen in such a manner that the
histogram still contains salient information.  For example, a 640 x 480 image with 16 bits per pixel gray value
resolution contains on average only 307200 / 65536 = 4.7 entries
per histogram bin, i.e., the histogram is too sparsely populated to
derive any useful statistics from it.  To be able to extract useful
thresholds from such a histogram, <a href="#Sigma"><i><code><span data-if="hdevelop" style="display:inline">Sigma</span><span data-if="c" style="display:none">Sigma</span><span data-if="cpp" style="display:none">Sigma</span><span data-if="com" style="display:none">Sigma</span><span data-if="dotnet" style="display:none">sigma</span><span data-if="python" style="display:none">sigma</span></code></i></a> would have to be
set to an extremely large value, which would lead to very high run
times and numerical problems.  The quantization in
<a href="gray_histo_abs.html"><code><span data-if="hdevelop" style="display:inline">gray_histo_abs</span><span data-if="c" style="display:none">gray_histo_abs</span><span data-if="cpp" style="display:none">GrayHistoAbs</span><span data-if="com" style="display:none">GrayHistoAbs</span><span data-if="dotnet" style="display:none">GrayHistoAbs</span><span data-if="python" style="display:none">gray_histo_abs</span></code></a> should therefore normally be chosen such that
the histogram contains a maximum of 1024 entries.  Hence, for images
with more than 10 bits per pixel, the quantization must be chosen
greater than 1.  The histogram returned by <a href="gray_histo_abs.html"><code><span data-if="hdevelop" style="display:inline">gray_histo_abs</span><span data-if="c" style="display:none">gray_histo_abs</span><span data-if="cpp" style="display:none">GrayHistoAbs</span><span data-if="com" style="display:none">GrayHistoAbs</span><span data-if="dotnet" style="display:none">GrayHistoAbs</span><span data-if="python" style="display:none">gray_histo_abs</span></code></a>
should furthermore be restricted to the parts that contain salient
information.  For example, for an image with 12 bits per pixel, the
quantization should be set to 4.  Only the first 1024 entries of the
computed histogram (which contains 16384 entries in this example)
should be passed to <code><span data-if="hdevelop" style="display:inline">histo_to_thresh</span><span data-if="c" style="display:none">histo_to_thresh</span><span data-if="cpp" style="display:none">HistoToThresh</span><span data-if="com" style="display:none">HistoToThresh</span><span data-if="dotnet" style="display:none">HistoToThresh</span><span data-if="python" style="display:none">histo_to_thresh</span></code>.  Finally,
<a href="#MinThresh"><i><code><span data-if="hdevelop" style="display:inline">MinThresh</span><span data-if="c" style="display:none">MinThresh</span><span data-if="cpp" style="display:none">MinThresh</span><span data-if="com" style="display:none">MinThresh</span><span data-if="dotnet" style="display:none">minThresh</span><span data-if="python" style="display:none">min_thresh</span></code></i></a> must be multiplied by 4 (i.e., the quantization),
while <a href="#MaxThresh"><i><code><span data-if="hdevelop" style="display:inline">MaxThresh</span><span data-if="c" style="display:none">MaxThresh</span><span data-if="cpp" style="display:none">MaxThresh</span><span data-if="com" style="display:none">MaxThresh</span><span data-if="dotnet" style="display:none">maxThresh</span><span data-if="python" style="display:none">max_thresh</span></code></i></a> must be multiplied by 4 and increased by 3
(i.e., the quantization minus 1).</p>
<h2 id="sec_execution">运行信息</h2>
<ul>
  <li>多线程类型:可重入(与非独占操作符并行运行)。</li>
<li>多线程作用域:全局(可以从任何线程调用)。</li>
  <li>未经并行化处理。</li>
</ul>
<h2 id="sec_parameters">参数表</h2>
  <div class="par">
<div class="parhead">
<span id="Histogramm" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Histogramm</span><span data-if="c" style="display:none">Histogramm</span><span data-if="cpp" style="display:none">Histogramm</span><span data-if="com" style="display:none">Histogramm</span><span data-if="dotnet" style="display:none">histogramm</span><span data-if="python" style="display:none">histogramm</span></code></b> (input_control)  </span><span>histogram-array <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[Union[int, float]]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer / </span><span data-if="hdevelop" style="display:inline">real)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long / </span><span data-if="dotnet" style="display:none">double)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i> / </span><span data-if="cpp" style="display:none">double)</span><span data-if="c" style="display:none"> (<i>Hlong</i> / </span><span data-if="c" style="display:none">double)</span></span>
</div>
<p class="pardesc">Gray value histogram.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Sigma" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Sigma</span><span data-if="c" style="display:none">Sigma</span><span data-if="cpp" style="display:none">Sigma</span><span data-if="com" style="display:none">Sigma</span><span data-if="dotnet" style="display:none">sigma</span><span data-if="python" style="display:none">sigma</span></code></b> (input_control)  </span><span>number <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">float</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Sigma for the Gaussian smoothing of the histogram.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>2.0</p>
<p class="pardesc"><span class="parcat">Suggested values:
      </span>0.5, 1.0, 2.0, 3.0, 4.0, 5.0</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>0.5
          ≤
        
    <span data-if="hdevelop" style="display:inline">Sigma</span>
    <span data-if="c" style="display:none">Sigma</span>
    <span data-if="cpp" style="display:none">Sigma</span>
    <span data-if="com" style="display:none">Sigma</span>
    <span data-if="dotnet" style="display:none">sigma</span>
    <span data-if="python" style="display:none">sigma</span>
    
          ≤
          30.0</code> (lin)</p>
<p class="pardesc"><span class="parcat">Minimum increment:
      </span>0.01</p>
<p class="pardesc"><span class="parcat">Recommended increment:
      </span>0.2</p>
</div>
  <div class="par">
<div class="parhead">
<span id="MinThresh" class="parname"><b><code><span data-if="hdevelop" style="display:inline">MinThresh</span><span data-if="c" style="display:none">MinThresh</span><span data-if="cpp" style="display:none">MinThresh</span><span data-if="com" style="display:none">MinThresh</span><span data-if="dotnet" style="display:none">minThresh</span><span data-if="python" style="display:none">min_thresh</span></code></b> (output_control)  </span><span>integer-array <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[int]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Minimum thresholds.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="MaxThresh" class="parname"><b><code><span data-if="hdevelop" style="display:inline">MaxThresh</span><span data-if="c" style="display:none">MaxThresh</span><span data-if="cpp" style="display:none">MaxThresh</span><span data-if="com" style="display:none">MaxThresh</span><span data-if="dotnet" style="display:none">maxThresh</span><span data-if="python" style="display:none">max_thresh</span></code></b> (output_control)  </span><span>integer-array <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[int]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Maximum thresholds.</p>
</div>
<h2 id="sec_example_all">例程 (HDevelop)</h2>
<pre class="example">
* Calculate thresholds from a byte image and threshold the image.
gray_histo (Image, Image, AbsoluteHisto, RelativeHisto)
histo_to_thresh (AbsoluteHisto, 4, MinThresh, MaxThresh)
threshold (Image, Region, MinThresh, MaxThresh)

* Calculate thresholds from a 12 bit uint2 image and threshold the image.
gray_histo_abs (Image, Image, 4, AbsoluteHisto)
AbsoluteHisto := AbsoluteHisto[0:1023]
histo_to_thresh (AbsoluteHisto, 16, MinThresh, MaxThresh)
MinThresh := MinThresh*4
MaxThresh := MaxThresh*4+3
threshold (Image, Region, MinThresh, MaxThresh)
</pre>
<h2 id="sec_predecessors">可能的前置算子</h2>
<p>
<code><a href="gray_histo.html"><span data-if="hdevelop" style="display:inline">gray_histo</span><span data-if="c" style="display:none">gray_histo</span><span data-if="cpp" style="display:none">GrayHisto</span><span data-if="com" style="display:none">GrayHisto</span><span data-if="dotnet" style="display:none">GrayHisto</span><span data-if="python" style="display:none">gray_histo</span></a></code>
</p>
<h2 id="sec_successors">可能的后置算子</h2>
<p>
<code><a href="threshold.html"><span data-if="hdevelop" style="display:inline">threshold</span><span data-if="c" style="display:none">threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">Threshold</span><span data-if="python" style="display:none">threshold</span></a></code>
</p>
<h2 id="sec_see">参考其它</h2>
<p>
<code><a href="auto_threshold.html"><span data-if="hdevelop" style="display:inline">auto_threshold</span><span data-if="c" style="display:none">auto_threshold</span><span data-if="cpp" style="display:none">AutoThreshold</span><span data-if="com" style="display:none">AutoThreshold</span><span data-if="dotnet" style="display:none">AutoThreshold</span><span data-if="python" style="display:none">auto_threshold</span></a></code>, 
<code><a href="binary_threshold.html"><span data-if="hdevelop" style="display:inline">binary_threshold</span><span data-if="c" style="display:none">binary_threshold</span><span data-if="cpp" style="display:none">BinaryThreshold</span><span data-if="com" style="display:none">BinaryThreshold</span><span data-if="dotnet" style="display:none">BinaryThreshold</span><span data-if="python" style="display:none">binary_threshold</span></a></code>, 
<code><a href="char_threshold.html"><span data-if="hdevelop" style="display:inline">char_threshold</span><span data-if="c" style="display:none">char_threshold</span><span data-if="cpp" style="display:none">CharThreshold</span><span data-if="com" style="display:none">CharThreshold</span><span data-if="dotnet" style="display:none">CharThreshold</span><span data-if="python" style="display:none">char_threshold</span></a></code>
</p>
<h2 id="sec_module">模块</h2>
<p>
Foundation</p>
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